refactor: replace usage of pytz with zoneinfo#475
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asmfstatoil
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Pull request overview
This PR refactors Tagreader’s timezone handling to remove the pytz dependency and use Python’s built-in zoneinfo instead, updating runtime code, tests, and documentation accordingly.
Changes:
- Replaced
pytztimezone usage withzoneinfo.ZoneInfoanddatetime.timezone.utcin core code paths. - Updated tests to construct/compare timezone-aware datetimes using
ZoneInfo, and refreshed docs/examples to use IANA zone names (e.g.,America/Sao_Paulo). - Minor cleanup (tuple unpacking style, timedelta slicing simplification).
Reviewed changes
Copilot reviewed 12 out of 13 changed files in this pull request and generated 4 comments.
Show a summary per file
| File | Description |
|---|---|
tagreader/utils.py |
Switches default timezone handling to ZoneInfo and updates naive-datetime tz attachment logic. |
tagreader/clients.py |
Updates client timezone parsing/validation to use ZoneInfo and removes pytz usage. |
tagreader/web_handlers.py |
Replaces pytz.UTC conversions with datetime.timezone.utc. |
tagreader/cache.py |
Replaces pytz.utc conversion with datetime.timezone.utc. |
tests/test_utils.py |
Updates datetime-with-timezone assertions to use ZoneInfo. |
tests/test_clients.py |
Updates timezone expectations to ZoneInfo. |
tests/test_PIHandlerREST.py |
Minor tuple unpacking cleanup in tests. |
tests/test_bucketcache.py |
Simplifies timestamp slicing using TS directly. |
tests/test_AspenHandlerREST_connect.py |
Adjusts test time constants. |
documentation/docs/about/usage/time-zone.md |
Updates timezone guidance from pytz to zoneinfo/tzdata. |
documentation/docs/about/usage/basic-usage.md |
Updates example timezone string to America/Sao_Paulo. |
docs/manual.md |
Updates manual to reflect zoneinfo usage and updated examples. |
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| if tz is None: | ||
| tz = ZoneInfo("Europe/Oslo") | ||
| date_stamp = convert_to_pydatetime(date_stamp) | ||
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|
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| if not date_stamp.tzinfo: |
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| if tz is None or tz == "": | ||
| tz = ZoneInfo("Europe/Oslo") | ||
| if isinstance(tz, str): | ||
| if tz in pytz.all_timezones: | ||
| self.tz = pytz.timezone(tz) | ||
| else: | ||
| raise ValueError(f"Invalid timezone string Given type was {type(tz)}") | ||
| try: | ||
| self.tz = ZoneInfo(tz) |
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